Mask is a photo of APS author. This photo includes 仮 仮 踏 踏 踏, Costume, mask, Event, Event tags. To download photo (S, L, M sizes) you need to register the account and log in.
As the free account, you can download for free with some limits.
As the premium account, you can download unlimited, no waiting time, etc. Enjoin premium membership at here